疏水化聚N-异丙基丙烯酰胺胶束的极性  

A Study on the Micellar Polarity of Hydrophobic Poly(N-isopropylacrylamides)

作　　者：史向阳[1] 吴世康[1] 

机构地区：[1]中国科学院感光化学研究所,北京100101

出　　处：《物理化学学报》1999年第2期127-132,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：利用Kamlet-Taft溶致变色比较法，在确定了二种探针化合物的峰值波数与溶剂的溶致变色参数表达式的基础上，研究了一系列不同疏水化修饰的聚N-异丙基丙烯酰胶类共聚物水溶液胶束的极性肝（π）和氢键供体能力（α）．结果发现，在摩尔投料比相同时，随着共聚物中丙烯酸酯烷基链的增长，共聚物水溶液胶束的π越来越小，α越来越大；在共聚物组成相同时，随着丙烯酸酯投料比的增大，共聚物水溶液波束的π也呈现相同的情况，而α则无明显的规律．对此现象作了讨论．The parameters of solvent polarity (π) and hydrogen bond donor abihty(α) of a scrics of different hydrophobically modified poly (N-isopropylacrylanmdes)(PNIPAM ) micelles have been stndiced usmg the Kamlet-Taft solvatochronmie comparson method,on the basis of the determination of the relationship between two probe s maximum wavenumber in fluorescence spectrum and solviatochromic parameters of different solvents.Results show that,at the same molar feed ratio,the-micellar environments of solubilized probe molecules become more nonpolar and have muchstronger hydrogen bond donating ability with the increase of the alkyl length of acrylic ester in thecopolymers. While for copolymer of N-isopropylacrylamides and octadecyl acrylate (NIPAM-C18).on inereasing the molar feed ratio of ODA, the polarity of the micellar environments have the samerule as the above,liowever,ther have no obvious rule.A preliminary discussion about thesephenomeua has been given.

关 键 词：水溶性高分子 PNIPAM 溶致变色法 胶束 极性 

分 类 号：O632.63[理学—高分子化学] O648.16[理学—化学]